I've found that I need to create simple ken-burns stlye slideshows for clients and events quite often. Since I have my images in Lightroom already it makes perfect sense to use the Slideshow Module... except that it looks like it hasn't been updated in years and has an array of issues...
Unable to specify frame rate,
Black frames or overlapping frames between many slides (possibly due to 29.97 preset frame rate?).
Glitches when using cross fades (Windows)
Clunky old-stlye Explorer navigation on Windows when selecting music.
Images don't scale up to fill the frame (clients don't always provide perfect resoluton images)
Limited to 1080p resolution
Pan and zoom isn't true pan and zoom, it crops the edges out as it zooms.
Exporting doesn't always work on my system (Windows).
Lightroom is a great application and the slideshow module is useful and makes logical sense to be included, please give it some love and improve it!